Re: how to enable trace in bison C++ parser

[Martin Jost]

"Gvnaena Pura" <tianran.chen@gmail.com> schrieb im Newsbeitrag 
1187804675.890164.195980@x40g2000prg.googlegroups.com">news:1187804675.890164.195980@x40g2000prg.googlegroups.com...
> Hi,
>
> I know for C parsers, one can simply #define YYDEBUG to be 1, and set
> yydebug=1 somewhere, and then the parser will print trace information
> at each step.  But how can I do this for C++ parser?  I
> used ::set_debug_level and ::set_debug_stream, and there is no effect
> at all.  How can I do this?  Thanks in advance.

According to my notes, this should do the trick. But I had my share of 
trouble  here.
Two notes:
- Try option -t to bison
- If you changed the prefix from yy to something else ('%name-prefix="..."' 
or '-p' to bison), you need to change it too on yydebug.

HTH

Martin